Made of the same ceramic material of the famous Triangular rods, this is an ultra fine ceramic bench stone. This ultra fine is really one of the finest stones we've seen and will produce a very polished edge. The stone feels very smooth to the touch but we promise, it does have ultra fine abrasive grit. The ceramic sharpening surface is very hard and durable. These ceramic stones are to be used dry (no oil or water). Cleaning is easy, just use a plastic abrasive pad and powdered abrasive cleanser. Stone measures 8" x 2" x 1/2".